What does this error mean?

Programming Help
1

Error in GetMouse (line 239)
screenRect=Screen(‘GlobalRect’,windowPtrOrScreenNumber);

Error in mouseresponse (line 110)
[x2,y2,buttons2]=GetMouse(window);

I have three different while loops, each one is a level. when mouse response for level 1 is met, it goes to 2 and then to level 3 if the mouse response for level 2 is met. The problem is i’m unable to make it step out of level 2 even after the mouse response. I’m guessing there is something wrong with my mouse initiation in level 2.

2

You didn’t include the actual error message, only the location where the error occurred. Please send the error (above these) as well

3

Error in function GlobalRect: Usage error
Argument was recognized as neither a window index nor a screen pointer
Error using Screen
Usage:

rect=Screen(‘GlobalRect’, windowPointerOrScreenNumber);

Error in GetMouse (line 239)
screenRect=Screen(‘GlobalRect’,windowPtrOrScreenNumber);

4

The error is what it says, when you call
[x2,y2,buttons2]=GetMouse(window); the variable “window” does not contain a window pointer. Window pointer is the thing you use to Screen(‘flip’) and such as well.
I strongly recommend you first do some of Peter Scarfe’s tutorials and really understand them, or if you have access, have a chat with someone who knows PTB around you. That’ll help you resolve a lot of these things yourself.

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5

Hi, thanks for taking your time to respond. i have gone through the online tutorials but its still not clear to me. As far as i understand window pointer refers to the window just opened right. I’m not sure why it does not recognizes the pointer. this is how i have initiated it. It would be extremely helpful if you could point out where i could be wrong.

    sca;
    close all;
    clear all;
    Screen('Preference', 'SkipSyncTests',2); 

PsychDefaultSetup(2);
screen=max(Screen('Screens'));
%opening window
[window, windowRect]=PsychImaging('Openwindow', screen, [0.2 0.2 0.2], [0 0 900 900]);
6

If there is an error in your code somewhere after you have opened your screen, the screen may be forced to close, and a subsequent call with the window pointer will cause an error as the window pointer is no longer valid…

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